I can't generalize those videos on extreme tattoo with anyone here or the average person. It probably would have been best not posted. It does show how there is a cultural and often occultic element that some use to express to others. Most people don't get tats for those reasons.
It showed extremes in the USA which are much more common. And there are primitive tribal cultures that do weird body mods, etc. I think it will become accepted until the average person is compelled to, but that's a different subject.
I don't think that you are doing anything cultic memorializing loved one . There's nothing wrong with reflection on your parents. I also think there's nothing wrong with gathering with family and memorialize the deceased. We only differ on how to do it.
Again, it doesn't matter to or affect me, so whatever someone else wants to do is between them and God as far as I'm concerned.
Tradition if gathering at the death if a loved one wasn't rebuked by Jesus or any O.T. commands that I can think of.
Perhaps the death cult idea others told you about might be this? Not sure.
I don't know much about it, other than watching this documentary.